Expand the data stored
Nice start, but I would like a number of additions before I replace my spreadsheet. My spreadsheet collects the same information as Fuelly plus the filling station (P66, breaktime, shell, etc) and the fuel type/octane. This allows additional MPG calculations based on the octane and filling stations used.
If the users can compare gas stations as well as vehicles, it could get really interesting. If a company shows a significant # of users who have reduced mileage at one versus another, the users here might start identifying gas stations or companies who might have bad fuel practices.
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